I called Dart to find out which headers they would recommend for my 331 w the Pro 1 heads and they sent me to Kooks. The problem is, Kooks only has applications for Fox bodies and I need headers for my '68. Do any of you guys know where I can get a set of 1 3/4" or 1 7/8" primary long tube headers that will bolt up to these heads and will fit my car? I like the Super Comps, but they are only 1 5/8" primary. I don't want to buy a set and find out they won't bolt up to the heads or need some serious modifications. I just wanna go faster damnit!